English 'Ireland' combines Old Irish Ériu with Germanic '-land' — the Celtic name may derive from PIE *piH-wer- (fertile), making Ireland literally 'the fertile land', while the Latin Hibernia is a false connection to winter.
An island in the North Atlantic, comprising the Republic of Ireland and Northern Ireland.
English 'Ireland' derives from Old English 'Īraland' — 'land of the Īras (Irish)'. The 'Īra-' element comes from Old Irish 'Ériu' (modern Irish 'Éire'), the name of the island. 'Ériu' derives from Proto-Celtic *Ēweriyū or *Īweriū, which the Greeks recorded as 'Iernē' (Ἰέρνη) and the Romans as 'Hibernia'. The Proto-Celtic form may derive from PIE *piHweriyeh₂ meaning 'fertile land' or 'fat land' (from PIE *piH-wer- 'fat, fertile'). The goddess Ériu in Irish mythology personified the island. The English form adds the Germanic '-land' suffix to the Celtic name. Key
The Latin name 'Hibernia' was a folk-etymological reshaping — Roman writers connected it to Latin 'hibernus' (wintry), suggesting Ireland was a frozen wasteland. In reality, the name derives from the same Celtic root as Éire and has nothing to do with winter. Ireland's climate, warmed by the Gulf Stream